diff --git a/TactilityKernel/Include/tactility/device.h b/TactilityKernel/Include/tactility/device.h
index 57bae4fb..d3622e3e 100644
--- a/TactilityKernel/Include/tactility/device.h
+++ b/TactilityKernel/Include/tactility/device.h
@@ -28,11 +28,18 @@ struct DeviceType {
 struct Device {
     /** The name of the device. Valid characters: a-z a-Z 0-9 - _ . */
     const char* name;
+
     /** The configuration data for the device's driver */
     const void* config;
+
     /** The parent device that this device belongs to. Can be NULL, but only the root device should have a NULL parent. */
     struct Device* parent;
-    /** Internal data */
+
+    /**
+     * Internal state managed by the kernel.
+     * Device implementers should initialize this to NULL.
+     * Do not access or modify directly; use device_* functions.
+     */
     struct DeviceInternal* internal;
 };
 
diff --git a/TactilityKernel/Include/tactility/driver.h b/TactilityKernel/Include/tactility/driver.h
index 59399a05..7ae115a3 100644
--- a/TactilityKernel/Include/tactility/driver.h
+++ b/TactilityKernel/Include/tactility/driver.h
@@ -29,7 +29,11 @@ struct Driver {
     const struct DeviceType* device_type;
     /** The module that owns this driver. When it is NULL, the system owns the driver and it cannot be removed from registration. */
     const struct Module* owner;
-    /** Internal data */
+    /**
+     * Internal state managed by the kernel.
+     * Driver implementers should initialize this to NULL.
+     * Do not access or modify directly; use driver_* functions.
+     */
     struct DriverInternal* internal;
 };
 
diff --git a/TactilityKernel/Include/tactility/module.h b/TactilityKernel/Include/tactility/module.h
index 69702db5..aa49ba05 100644
--- a/TactilityKernel/Include/tactility/module.h
+++ b/TactilityKernel/Include/tactility/module.h
@@ -38,7 +38,6 @@ struct Module {
      * Desirable format "platform-esp32", "lilygo-tdeck", etc.
      */
     const char* name;
-
     /**
      * A function to initialize the module.
      * Should never be NULL.
@@ -46,21 +45,23 @@ struct Module {
      * @return ERROR_NONE if successful
      */
     error_t (*start)(void);
-
     /**
      * Deinitializes the module.
      * Should never be NULL.
      * @return ERROR_NONE if successful
      */
     error_t (*stop)(void);
-
     /**
      * A list of symbols exported by the module.
      * Should be terminated by MODULE_SYMBOL_TERMINATOR.
      * Can be a NULL value.
      */
     const struct ModuleSymbol* symbols;
-
+    /**
+     * Internal state managed by the kernel.
+     * Module implementers should initialize this to NULL.
+     * Do not access or modify directly; use module_* functions.
+     */
     struct ModuleInternal* internal;
 };